Current balance control system and method and multi-phase power supply

Abstract

The embodiment of the invention discloses a current balance control system and method and a multi-phase power supply, relates to the technical field of power supplies, and can improve the control precision of current balance to a certain extent. The method comprises the following steps: a resistor calibration compensation module configured to perform fixed resistance consistency calibration on sampling resistors of all phases in a multi-phase current sampling circuit in a test stage to obtain fixed deviation calibration parameters of the sampling resistors of all phases relative to a calibration reference resistor; acquiring current sampling signals of each phase in a working state, and calibrating the current sampling signals according to the fixed deviation calibration parameters to obtain calibrated current sampling signals of each phase; and the current equalization control module is configured to adjust the conduction time of each phase of pulse width modulation signal according to the difference value between the calibration current sampling signal and the target current sampling signal, so that each phase of current is equalized.

Description

Technical Field

[0001] This application relates to the field of power supply technology, and in particular to a current balancing control system, method and multiphase power supply. Background Technology

[0002] Multiphase power supply systems (VRMs) are core components for achieving efficient power supply in electronic devices. They distribute power load through multiphase parallel output, improving system stability and output efficiency. Current balancing, a key technology in multiphase power supply systems, monitors the difference between the output current of each phase and the target current, adjusting the current magnitude of each phase in real time to ensure balanced current distribution and avoid problems such as device overheating, accelerated aging, and decreased system efficiency caused by current imbalance.

[0003] However, current sampling in a multiphase system depends on the sampling resistor. As the number of phases increases, the inherent resistance deviation of each phase resistor varies in terms of layout and materials, which significantly increases the inconsistency and directly affects the current sampling accuracy. This becomes the core factor restricting the improvement of current balancing accuracy. Summary of the Invention

[0004] In view of this, embodiments of this application provide a current balancing control system, method, and multiphase power supply, which can improve the control accuracy of current balancing to a certain extent.

[0005] In a first aspect, embodiments of this application provide a current balancing control system, including: The resistance calibration and compensation module is configured to: perform fixed resistance consistency calibration on the sampling resistors of each phase in the multi-phase current sampling circuit during the testing phase to obtain fixed deviation calibration parameters of each phase sampling resistor relative to the calibration reference resistor; acquire the current sampling signals of each phase under the working state, and calibrate the current sampling signals according to the fixed deviation calibration parameters to obtain the calibration current sampling signals of each phase; The current equalization control module is configured to adjust the conduction time of each phase pulse width modulation signal according to the difference between the calibration current sampling signal and the target current sampling signal, so as to make the current of each phase equal.

[0006] According to a specific embodiment of this application, the resistance calibration compensation module is specifically configured as follows: based on the standard current, the sampled voltage signal, and the calibration reference resistor, it calculates the fixed deviation calibration parameters between the sampled resistor and the calibration reference resistor of each phase. The fixed deviation calibration parameters include a relative deviation coefficient and a fixed offset. The sampled voltage signal is a standard current injected into the current sampling circuit of each phase at least twice during the test phase, flowing through the sampled resistor, and the voltage signal across the sampled resistor is obtained by sampling through an analog-to-digital converter. The fixed deviation calibration parameters are stored in a register.

[0007] According to a specific embodiment of this application, the step of calibrating the current sampling signal according to the fixed deviation calibration parameter to obtain the calibration current sampling signal of each phase includes: calculating the calibrated voltage signal based on the sampling voltage signal, the relative deviation coefficient and the fixed offset according to the calibration formula Vcscomp=(VcsADC+Koffset)×Kr. Wherein, VcsADC is the original sampled voltage signal acquired in real time by the multiphase current sampling circuit, Vcscomp is the calibrated voltage signal used as the input signal for current deviation calculation, Koffset is the fixed offset, and Kr is the relative deviation coefficient of the sampling resistor in each phase at room temperature.

[0008] According to a specific embodiment of this application, the resistance calibration and compensation module is further configured to perform temperature characteristic calibration on the sampling resistors of each phase during the testing phase to obtain the temperature drift coefficient of each phase sampling resistor; and to collect the current temperature of each phase sampling resistor within a preset distance range during operation, and calculate the temperature drift compensation parameter of each phase sampling resistor based on the current temperature and the temperature drift coefficient; the resistance calibration and compensation module is further configured to calibrate the current sampling signal according to the fixed deviation calibration parameter and the temperature drift compensation parameter.

[0009] According to a specific embodiment of this application, the calibration of the current sampling signal based on the fixed deviation calibration parameter and the temperature drift compensation parameter includes: calibrating the current sampling signal according to the calibration formula Vcscomp=(VcsADC+Koffset)×krt to obtain a calibrated voltage signal, where krt=Kr×[1+a×(T-T0)+b×(T-T0)²], krt is the temperature drift compensation parameter, Kr is the relative deviation coefficient of the sampling resistor in each phase at room temperature, Koffset is the fixed offset, a is the first-order calibration compensation coefficient, b is the second-order calibration compensation coefficient, krt is the resistance compensation coefficient, T is the current temperature, and T0 is the room temperature reference.

[0010] According to one specific embodiment of this application, the system further includes: a temperature calibration compensation module configured to acquire the temperature of each phase power device in the working state, and obtain a temperature deviation correction value for each phase based on the temperature of each phase power device; the current equalization control module is further configured to generate a conduction time adjustment value of a pulse width modulation signal adapted to the temperature of each phase power device based on the temperature deviation correction value and the difference between the calibration current sampling signal and the target current sampling signal, and adjust the conduction time of each phase pulse width modulation signal according to the conduction time adjustment value to make the current of each phase equal.

[0011] Secondly, this application also provides a current equalization method, comprising: The current sampling signals collected by the sampling resistors of each phase are acquired, and the current sampling signals are calibrated according to the fixed deviation calibration parameters of each phase sampling resistor relative to the calibration reference resistor to obtain the calibrated current sampling signals of each phase; wherein, the fixed deviation calibration parameters are obtained by performing fixed resistance value consistency calibration on the sampling resistors of each phase in the multi-phase current sampling circuit during the testing phase; according to the difference between the calibrated current sampling signals and the target current sampling signals, the conduction time of the pulse width modulation signals of each phase is adjusted to make the current of each phase equal.

[0012] According to a specific embodiment of this application, the fixed resistance consistency calibration of the sampling resistors of each phase in the multiphase current sampling circuit during the testing phase includes: injecting a standard current into each phase current sampling circuit at least twice in succession, and obtaining the sampling voltage signal across the sampling resistor at that time through an analog-to-digital converter; calculating a fixed deviation calibration parameter between the sampling resistor of each phase and the calibration reference resistor based on the standard current, the sampling voltage signal, and the calibration reference resistor, wherein the fixed deviation calibration parameter includes a relative deviation coefficient and a fixed offset; and storing the fixed deviation calibration parameter in a register.

[0013] According to a specific embodiment of this application, the calculation of the fixed deviation calibration parameters between the sampling resistors of each phase and the calibration reference resistor includes: calibrating the current sampling signal according to the fixed deviation calibration parameters to obtain the calibration current sampling signal of each phase, including: calculating the calibrated voltage signal based on the sampling voltage signal, the relative deviation coefficient, and the fixed offset according to the calibration formula Vcscomp=(VcsADC+Koffset)×Kr; wherein, VcsADC is the original sampling voltage signal acquired in real time by the multi-phase current sampling circuit, Vcscomp is the calibrated voltage signal used as the input signal for current deviation calculation, Koffset is the fixed offset, and Kr is the relative deviation coefficient of the sampling resistors in each phase at room temperature.

[0014] According to a specific embodiment of this application, before acquiring the current sampling signal collected by each phase sampling resistor, the method further includes: in the testing phase, calibrating the temperature characteristics of each phase sampling resistor to obtain the temperature drift coefficient of each phase sampling resistor. While or after acquiring the current sampling signals collected by the sampling resistors of each phase, the method further includes: acquiring the current temperature within a preset distance range of each phase sampling resistor, and calculating the temperature drift compensation parameters of each phase sampling resistor based on the current temperature and the temperature drift coefficient. The current sampling signal is calibrated according to the fixed deviation calibration parameters and temperature drift compensation parameters, and the calibrated signal is used as the calibration current sampling signal.

[0015] According to a specific embodiment of this application, calibrating the current sampling signal according to the fixed deviation calibration parameters and temperature drift compensation parameters includes: calibrating the current sampling signal according to the calibration formula Vcscomp=(VcsADC+Koffset)×krt to obtain a calibrated voltage signal, where krt=Kr×[1+a×(T-T0)+b×(T-T0)²], krt is the resistance compensation coefficient at the current temperature, Kr is the relative deviation coefficient of the sampling resistance in each phase at room temperature, Koffset is the fixed offset, a is the first-order calibration compensation coefficient, b is the second-order calibration compensation coefficient, T is the current temperature, and T0 is the room temperature reference.

[0016] According to a specific embodiment of this application, before adjusting the conduction time of each phase pulse width modulation signal based on the difference between the calibration current sampling signal and the target current sampling signal, the method further includes: collecting the temperature of each phase power device, calculating the deviation between the temperature of each phase and the average temperature, and obtaining a temperature deviation correction value for each phase based on the deviation. The step of adjusting the conduction time of each phase pulse width modulation signal based on the difference between the calibration current sampling signal and the target current sampling signal includes: generating conduction time adjustment values ​​of pulse width modulation signals adapted to the temperature of each phase power device based on the temperature deviation correction value and the difference, and adjusting the conduction time of each phase pulse width modulation signal based on the conduction time adjustment values.

[0017] According to one specific embodiment of this application, the target current sampling signal is a sampling current of a certain phase or the average current of the sampling currents of all phases.

[0018] Thirdly, embodiments of this application also provide a multiphase power supply, including: A multi-phase power branch, each phase of the power branch is equipped with a current sampling circuit, the current sampling circuit including a sampling resistor, for acquiring the current sampling signal of each phase; The current balancing control system integrates: The resistance calibration compensation module is configured to perform a fixed resistance consistency calibration on the sampling resistors of the current sampling circuits of each phase during the testing phase, and obtain a fixed deviation calibration parameter of the sampling resistors of each phase relative to the calibration reference resistor. The current equalization control module is configured to: acquire current sampling signals of each phase in the working state; calibrate the current sampling signals according to the fixed deviation calibration parameters; and adjust the conduction time of the pulse width modulation signal of the corresponding phase power branch based on the difference between the calibrated current sampling signal and the target current, so as to make the current of each phase equal.

[0019] According to a specific embodiment of this application, the resistance calibration and compensation module is further configured to perform temperature characteristic calibration on each phase sampling resistor during the testing phase to obtain the temperature drift coefficient of each phase sampling resistor; and to collect the current temperature of each phase sampling resistor within a preset distance range during the working state, and calculate the temperature drift compensation parameters of each phase sampling resistor based on the current temperature and the temperature drift coefficient. The resistance calibration and compensation module is further configured to calibrate the current sampling signal according to the temperature drift compensation parameter while or after calibrating the current sampling signal according to the fixed deviation calibration parameter.

[0020] According to one specific embodiment of this application, the current balancing control system further integrates a temperature balancing module, which is configured as follows: Collect temperature information for each phase power branch; A temperature deviation correction value is generated based on the temperature information; The current equalization control module is further configured to adjust the conduction time of the pulse width modulation signal based on the temperature deviation correction value and the difference.

[0021] The current balancing control system, method, and multiphase power supply provided in this application, through a fixed resistance value consistency calibration of the sampling resistors of each phase in the multiphase current sampling circuit during the testing phase, obtains a fixed deviation calibration parameter for each phase sampling resistor relative to the calibration reference resistor. During the operation phase, the current sampling signal collected by the sampling resistor is calibrated according to the fixed deviation calibration parameter, eliminating the influence of inherent defects in the sampling resistor on the current sampling accuracy. Then, based on the calibrated current sampling signal, the conduction time of the pulse width modulation signal of each phase is adjusted to control the current balancing, thereby improving the control accuracy of the current balancing to a certain extent. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or some of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic block diagram of a current balancing control system provided in an embodiment of the prior art; Figure 2 This is a schematic block diagram of a current balancing control system provided in an embodiment of this application; Figure 3 A schematic block diagram of a current balancing control system provided in another embodiment of this application; Figure 4 This is a schematic block diagram of a multiphase power supply circuit structure provided in an embodiment of this application; Figure 5 A schematic block diagram of a multiphase power supply circuit structure provided in another embodiment of this application; Figure 6 A schematic diagram of the current balancing method provided in one embodiment of the application; Figure 7 This is a schematic diagram of an electronic device structure provided in an embodiment of this application. Detailed Implementation

[0024] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0025] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0026] To enable those skilled in the art to better understand the technical concept, implementation scheme and beneficial effects of the embodiments of this application, detailed descriptions are provided below through specific embodiments.

[0027] In a multiphase power supply system (Multiphase VRM), there are multiple switching circuits, multiphase current sampling circuits, and a current balancing control system (generally also called a multiphase power supply control system). Current balancing is a core technology for ensuring system stability and improving power supply efficiency. It is typically achieved by adjusting the output current distribution of each phase to prevent overload and overheating of local power devices (DrMOS), accelerated aging, and decreased system efficiency caused by current imbalance. However, see... Figure 1 Current balancing control systems generally rely on high-precision control algorithms such as PI (Proportional-Integral) compensation and Sigma-delta regulators to optimize balancing accuracy, but they do not consider the inherent resistance deviation of the sampling resistor in the multiphase current sampling circuit.

[0028] As the number of phases increases, differences in the layout and material properties of the sampling resistors in each phase can lead to resistance value inconsistencies, directly introducing current sampling errors. This means that even with high-precision control algorithms, the current balancing accuracy is still limited by resistance deviations, which in turn affects the stability of the multi-phase power supply.

[0029] Therefore, this application provides a current balancing control system for real-time calibration and compensation in a multiphase power supply. By calibrating the fixed resistance deviation of the sampling resistor during the testing phase, the sampling error is eliminated from the source, the current sampling accuracy is improved, and the current balancing effect is guaranteed.

[0030] See Figure 2 As shown, the current balancing control system 100 includes a resistor calibration module 110 and a current balancing control module 120. The input terminal of the resistor calibration module 110 is coupled to the output terminal of the multiphase current sampling circuit 200 to receive the current sampling signal collected by the multiphase current sampling circuit 200. The output terminal of the resistor calibration module 110 is coupled to the input terminal of the current balancing control module 120, and the output terminal of the current balancing control module 120 is coupled to the control terminal of each phase power device in the multiphase power supply.

[0031] Specifically, the resistance calibration compensation module 110 is configured to: perform fixed resistance consistency calibration on the sampling resistors of each phase in the multiphase current sampling circuit 200 during the testing phase to obtain fixed deviation calibration parameters of each phase sampling resistor relative to the calibration reference resistor; acquire the current sampling signals of each phase output by the multiphase current sampling circuit 200 under working conditions, and calibrate the current sampling signals according to the fixed deviation calibration parameters to obtain the calibration current sampling signals of each phase; the current equalization control module 120 is configured to adjust the conduction time of each phase pulse width modulation (PWM) signal according to the difference between the calibration current sampling signal and the target current sampling signal to make the current of each phase equal.

[0032] See Figure 4 As shown, the multiphase current sampling circuit 200 provides signal input to the resistor calibration and compensation module, which is used to convert the inductor current of the power device into a quantifiable voltage signal. It integrates a high-precision current mirror feedback module 201, a sampling resistor 202, an analog low-pass filter 203 (marked as Analpf in the box in the figure), a multiplexed analog-to-digital converter module 204, and a digital low-pass filter 205 (marked as Diglpf in the box in the figure).

[0033] See Figure 4 and Figure 5 As shown, the current mirror feedback module 201 adopts a high-precision current mirror structure to transmit the inductor current I in each phase DrMOS path.L The sampling current Ics is fed back at a fixed ratio to ensure that the sampling current Ics is consistent with the inductor current I. L The linear correspondence is used for subsequent accurate sampling; The sampling resistor 202 is configured independently for each phase and is used to convert the sampled current Ics into the sampled voltage Vcs. During mass production, the sampling resistor 202 is prone to a typical resistance value consistency deviation of 1% to 5% due to differences in PCB layout and material batch fluctuations. In addition, it is easily affected by temperature during operation, which can cause resistance value drift. This affects the accuracy of current sampling in the application. As the input signal of the subsequent current balance control module, it will further have an adverse effect on the current balance judgment and control.

[0034] Therefore, in this embodiment, the current sampling signal of the sampling resistor 202202 is calibrated by introducing a resistor calibration compensation module 110 to eliminate the problem that the accuracy of the current sampling signal is affected by the fixed deviation of the sampling resistor 202, thereby improving the accuracy of subsequent current equalization control.

[0035] Analog low-pass filter 204 is used to suppress high-frequency noise generated by DrMOS power devices.

[0036] The multiplexed analog-to-digital converter module 203 (ADC) adopts a time-division polling sampling method to sequentially acquire the sampling voltage Vcs of each phase, reducing hardware redundancy in single-phase signal acquisition. At the same time, through unified clock control, it can ensure that the sampling timing of each phase is consistent, avoiding additional errors introduced by timing deviations.

[0037] The digital low-pass filter 205 is used to filter out the digital quantization noise sampled by the multiplexed ADC203 and output a stable voltage signal that reflects the average current of each phase, providing a reliable input signal for the current equalization control system.

[0038] For example, the testing phase specifically refers to the ATE (Automatic Test Equipment) testing process before shipment. The calibration reference resistor is a resistance reference used to determine the fixed deviation of the sampling resistor 202 for each phase. For the same sampling resistor, it can be regarded as the nominal value R0 of the resistance, or it can be a specially set reference resistor used to evaluate the fixed deviation of the sampling resistor 202. In the working state, the current sampling signal can be the original voltage signal generated across the sampling resistor 202 in the multi-phase current sampling circuit 200, which is processed by the analog low-pass filter 203 and the digital low-pass filter 205 to filter out the high-frequency noise generated by the switching of the DrMOS power device, and then enters the resistance calibration compensation module 110 to correct the current sampling signal according to the fixed deviation calibration parameters.

[0039] In some embodiments, the resistance calibration compensation module 110 is further configured to: calculate a fixed deviation calibration parameter between the sampling resistor 202 of each phase and the calibration reference resistor based on the standard current, the sampled voltage signal and the calibration reference resistor, wherein the fixed deviation calibration parameter includes a relative deviation coefficient and a fixed offset; store the fixed deviation calibration parameter in a register; wherein the sampled voltage signal is the standard current Iref injected into each phase of the multiphase current sampling circuit 200 at least twice during the test phase, flowing through the sampling resistor 202, and the voltage signal across the sampling resistor 202 at that time is obtained by sampling through an analog-to-digital converter.

[0040] Specifically, referring to Figure 3, during the ATE test before the multiphase power supply leaves the factory, the resistor calibration compensation module 110 injects standard currents Iref1 and Iref2 of different amplitudes into the sampling resistors 202 of each phase twice through the CS pin; the voltage signal generated by the standard current flowing through the sampling resistors 202 is output as sampling data through the analog low-pass filter, the multiplexed analog-to-digital converter module 203 and the digital low-pass filter 205, resulting in two sampling voltages VcsADC1 and VcsADC2; based on the simultaneous equation Vcscomp = (VcsADC1 + Koffset) ×Kr, the fixed deviation calibration parameters Kr and Koffset are solved.

[0041] Wherein, Vcscomp is the sampling voltage after step-size calibration. Ideally, the ideal resistance value is the target resistance value R0 of the chip design. R0 is regarded as the calibration reference resistance of the sampling resistor 202, that is, Vcscomp = Iref × R0; VcsADC is the actual output sampling voltage; Kr is the relative deviation coefficient of the sampling resistor 202 in each phase at room temperature, which is used to reflect the ratio between the actual resistance value of the sampling resistor 202 and the calibration reference resistance value; Koffset is the fixed offset of the sampling resistor 202 in each phase.

[0042] After calculating the fixed deviation calibration parameters for each phase, the fixed deviation calibration parameters Kr and Koffset are stored in a non-volatile register. This ensures that the parameters are not lost even if the multi-phase power supply is interrupted.

[0043] During the working phase, the resistance calibration compensation module can correct the current sampling signals of each phase by calling the fixed deviation calibration parameters stored in the register during the testing phase. Therefore, in some embodiments, calibrating the current sampling signals according to the fixed deviation calibration parameters to obtain the calibrated current sampling signals of each phase includes: calculating the calibrated voltage signal based on the sampled voltage signal, the relative deviation coefficient, and the fixed offset, according to the calibration formula Vcscomp=(VcsADC+Koffset)×Kr. Wherein, VcsADC is the actual sampling voltage corresponding to the current sampling signal acquired in real time by the multiphase current sampling circuit 200, Vcscomp is the calibrated voltage signal used as the input signal for current deviation calculation, Koffset is the fixed offset, and Kr is the relative deviation coefficient of the sampling resistor 202 in each phase at room temperature.

[0044] In this embodiment, by calibrating the deviation of the sampling resistor 202 as described above, the calibrated voltage signal is obtained, which is the calibration current sampling signal of each phase. This eliminates the influence of the fixed deviation of the sampling resistor 202 and transmits it directly to the current equalization control module as an input signal, which can provide more accurate calculation parameters for subsequent PWM conduction time adjustment.

[0045] Although the above methods can improve the problem of inaccurate phase current balance control caused by the deviation of the sampling resistor 202 itself, in the actual working scenario of multiphase power supply, temperature changes will cause the resistance value of the sampling resistor 202 to drift. Even if the resistance consistency meets the standard after calibration at room temperature, the resistance drift will still introduce sampling error again under high temperature or low temperature environment, resulting in distortion of the calibration current sampling signal and affecting the current balance accuracy.

[0046] Therefore, by calibrating the current sampling signal according to fixed deviation calibration parameters to eliminate the influence of inherent resistance deviation on current balance control, the problem of temperature-induced deviation in the current sampling signal can also be improved. In some embodiments, the resistance calibration compensation module is further configured to perform temperature characteristic calibration on each phase sampling resistor 202 during the testing phase to obtain the temperature drift coefficient of each phase sampling resistor 202; and to collect the current temperature of each phase sampling resistor 202 within a preset distance range during operation, and calculate the temperature drift compensation parameters of each phase sampling resistor 202 based on the current temperature and the temperature drift coefficient.

[0047] The resistance calibration and compensation module is further configured to calibrate the current sampling signal according to the fixed deviation calibration parameters and the temperature drift compensation parameters.

[0048] After obtaining the fixed deviation calibration parameters during the ATE testing phase, the temperature drift compensation parameters are obtained. The temperature drift compensation parameters mainly include the first-order calibration compensation coefficient and the second-order calibration compensation coefficient.

[0049] In some embodiments, calibrating the current sampling signal according to the fixed deviation calibration parameter and the temperature drift compensation parameter includes: calibrating the current sampling signal according to the calibration formula Vcscomp=(VcsADC+Koffset)×krt to obtain a calibrated voltage signal, where krt=Kr×[1+a×(T-T0)+b×(T-T0)²], krt is the resistance compensation coefficient at the current temperature, Kr is the relative deviation coefficient of the sampling resistor 202 in each phase at room temperature, Koffset is the fixed offset, a is the first-order calibration compensation coefficient, b is the second-order calibration compensation coefficient, T is the current temperature, and T0 is the room temperature reference.

[0050] Current sampling in multiphase power supplies relies on a sampling resistor to convert the current signal into a voltage signal. However, the resistance of the sampling resistor changes with temperature (referred to as temperature drift). This temperature drift is not a simple linear change. It is approximately linear from low temperature to room temperature, but exhibits significant nonlinearity at high temperatures, which can easily lead to voltage sampling distortion and affect the accuracy of current balancing.

[0051] Specifically, during the ATE testing phase, three key temperature points are determined based on the typical operating temperature range of the multiphase power supply: a standard reference temperature T0 (typically the normal operating temperature of the entire unit), a high temperature point T1 (which can be selected as the highest tolerable temperature of the entire unit), and a low temperature point T2 (which can be selected as the lowest operating temperature of the entire unit). At each temperature point, a standard current is injected, and the sampling voltage corresponding to the current sampling signal is collected. The actual resistance value of the sampling resistor 202 at the current temperature is calculated, thus obtaining the resistance value data of the sampling resistor 202 at different temperatures.

[0052] Based on resistance data at three temperature points, the resistance calibration and compensation module uses a quadratic polynomial fitting method. The quadratic polynomial fitting formula is R(T) = R0 × kc × [1 + α × (T - T0) + β × (T - T0)²], where R0 is the calibration reference resistance of the sampling resistor 202 at temperature T0. The first-order temperature drift fitting coefficient α and the second-order temperature drift fitting coefficient β of each phase sampling resistor 202 are obtained. The first-order temperature drift fitting coefficient α reflects the rate of linear change of resistance with temperature; the second-order temperature drift fitting coefficient β reflects the trend of nonlinear change of resistance with temperature. This fitting method can accurately cover the resistance change pattern over a wide temperature range, avoiding compensation deviations in linear fitting at extreme temperatures. It should be noted that in engineering fitting involving physical quantities, the fitting coefficients can be dimensional. In this paper, the first-order temperature drift fitting coefficient α and the second-order temperature drift fitting coefficient β are dimensional. Correspondingly, the first-order calibration compensation coefficient α and the second-order calibration compensation coefficient β are also dimensional, aiming to ensure consistency of dimensions during the calculation process.

[0053] If the temperature drift consistency of the sampling resistor 202 in each phase is good during mass production, such as the difference in α and β between different phases being less than 0.1%, the calibration at high and low temperature points T1 and T2 can be omitted, and only the fixed deviation calibration at room temperature needs to be retained to simplify the testing process and reduce production costs. If the temperature drift consistency is poor, the calibration at all three temperature points must be performed to ensure the accuracy of temperature drift compensation for each phase. The temperature drift coefficients a and b of each phase, along with the room temperature reference T0 and the fixed deviation calibration parameters Kr and Koffset, are stored together in a non-volatile register.

[0054] The core of calibration in the various embodiments of this application is to offset the deviation of the temperature drift fitting coefficients. This requires taking the reciprocal of the resistance temperature drift term, which is generally approximated by a quadratic polynomial. a and b are the inverse calibration compensation coefficients obtained from the fitting. The purpose of ATE testing is to calculate these two parameters, where a is the first-order temperature drift calibration compensation coefficient corresponding to α, i.e., the linear calibration compensation coefficient, and b is the second-order temperature drift calibration compensation coefficient corresponding to β. The specific calibration fitting to obtain a and b is a mature technology, and to highlight the main innovative aspect of the invention, it will not be elaborated further.

[0055] When the multiphase power supply is working, the resistance calibration and compensation module obtains the current temperature T of each phase sampling resistor 202 in real time through a temperature sensor placed close to each phase sampling resistor 202. The distance between the temperature sensor and the sampling resistor 202 is controlled within a preset range to ensure that the collected temperature is consistent with the actual temperature of the sampling resistor 202. Then, it calls the Kr, a, b and T0 stored in the register to calculate the resistance compensation coefficient krt at the current temperature. The calculation formula is krt=Kr×[1+a×(T-T0)+b×(T-T0)²]. This resistance compensation coefficient krt integrates fixed deviation compensation and temperature drift compensation, which can simultaneously eliminate the influence of fixed resistance deviation and temperature drift deviation on the current sampling signal of each phase.

[0056] The resistor calibration and compensation module substitutes the actual sampled voltage signal and fixed offset into the compensation and calibration formula Vcscomp=(VcsADC+Koffset)×krt to calculate the voltage signal corresponding to the dual calibration of the current sampling signal of each phase. This eliminates the fixed deviation at room temperature and offsets the effect of resistance temperature drift at the current temperature. After being transmitted to the current balance control module, it is used for current deviation calculation, which effectively reduces or improves the consistency deviation of the sampling resistor 202. This ensures that the current balance judgment has high accuracy even under wide temperature conditions, avoids current imbalance in each phase due to temperature fluctuations, effectively reduces the risk of overheating of power devices due to current imbalance, and thus improves the overall efficiency of the multiphase power supply system.

[0057] It is understandable that uneven heat dissipation on the board can lead to temperature imbalances in DrMOS power devices across different phases. For example, some DrMOS phases may have significantly higher temperatures than other phases due to their proximity to heat sources or denser layouts. DrMOS in high-temperature phases may age faster due to continuous high loads, or even experience thermal runaway.

[0058] Therefore, in some embodiments, the system further includes: a temperature calibration and compensation module, configured to acquire the temperature of each phase power device in the working state, and obtain a temperature deviation correction value for each phase based on the temperature of each phase power device; The current equalization control module is further configured to generate a conduction time adjustment value for a pulse width modulation signal adapted to the temperature of each phase power device based on the temperature deviation correction value and the difference between the calibration current sampling signal and the target current sampling signal, and adjust the conduction time of each phase pulse width modulation signal according to the conduction time adjustment value to make the current of each phase equal.

[0059] See Figure 5 As shown, specifically, the temperature calibration and compensation module collects the temperature of each phase DrMOS in real time, denoted as Tdrmosi, through temperature sensors distributed on the package surface or substrate of each phase DrMOS power device (note: the settings are different from the temperature sensor of sampling resistor 202). The sampling period is set to 10ms~50ms. The temperature calibration and compensation module calculates the average temperature of all working phase DrMOS power devices, denoted as Tavg, where Tavg=(Tdrmos1+Tdrmos2+...+Tdrmosn) / n, and n is the number of working phases. Next, it calculates the deviation of each phase temperature from the average temperature, denoted as ΔTi, where ΔTi=Tdrmosi-Tavg. A positive ΔTi indicates that the temperature of that phase DrMOS is higher than the average level, and its load needs to be reduced; a negative ΔTi indicates that the temperature is lower than the average level, and the load can be appropriately increased to balance the temperature.

[0060] Specifically, based on ΔTi, the temperature deviation correction value ΔCSthermal can be generated in one of two ways.

[0061] Linear conversion method: ΔCSthermal = ΔTi × Gthermal, where Gthermal is the preset gain coefficient, usually a negative value, such as -0.02A / ℃, meaning that for every 1℃ increase in temperature above the average value, the correction value decreases by 0.02A, correspondingly reducing the target current of that phase. It should be noted that the preset gain coefficient here is only an example and can be selected according to specific operating conditions.

[0062] The lookup table conversion method is as follows: the correction value table stored in the register is queried according to the range of ΔTi. The data in the correction value table is based on actual test results. For example, when ΔTi=5℃, ΔCSthermal=-0.1A, and when ΔTi=10℃, ΔCSthermal=-0.2A. This method can optimize the correction value for the nonlinear temperature characteristics of DrMOS and has high compensation accuracy.

[0063] To avoid excessive interference from the temperature compensation signal with the stability of current balancing, the temperature calibration compensation module adds the temperature deviation correction value to the input error of the current balancing control module. Specifically, in some embodiments, the current balancing control module calculates the PWM conduction time adjustment value based on the difference between the calibration current sampling signal and the target current sampling signal. After adding ΔCSthermal, the total deviation becomes: ΔCStotal = ΔCS + ΔCSthermal. The current balancing control module generates conduction time adjustment values ​​adapted to the temperature of each phase DrMOS based on ΔCStotal.

[0064] Please refer to Figure 4 Specifically, the current balancing control module includes a high-resolution on-time (Ton) real-time compensation calculation module and a PWM control module. The compensation calculation module considers the system stability of the entire current balancing loop and is typically implemented using PI (Proportional-Integral Compensation) compensation or first-order and second-order compensation circuits. The coefficient settings for the compensation module require analysis of the system's phase margin and gain margin. The high-precision PWM control module can be implemented using a Sigma-Aldrich regulator or a Delay-Locked Loop (DLL). Since the specific working principles of the PI compensation module and the Sigma-Aldrich module are mature technologies, they will not be elaborated upon further for the sake of brevity and clarity, highlighting the innovative intent of this application.

[0065] Please refer to Figure 4 The resistance calibration compensation module 110 and the temperature calibration compensation module 130 can be connected sequentially to send the comprehensive deviation value to the current equalization control module 120. Alternatively, see... Figure 5 The temperature calibration compensation module and the resistance calibration compensation module can send the calibrated and compensated data to the current equalization module as input signals, and then the current equalization control module performs comprehensive calculations.

[0066] If a phase ΔTi is positive, meaning the temperature is too high, ΔCSthermal is negative, ΔCStotal decreases, the on-time adjustment value decreases accordingly, the PWM on-time of that phase is shortened, the output current decreases, the power consumption and heat generation of DrMOS decrease, and the temperature gradually drops.

[0067] If ΔTi is negative for a certain phase, the temperature is too low, ΔCSthermal is positive, ΔCStotal increases, the conduction time adjustment value increases accordingly, the PWM conduction time of that phase is extended, the output current is increased, thereby achieving the purpose of balanced current control of each phase.

[0068] It should be noted that the current balancing methods provided in the above embodiments of this application can be embedded in a manufactured physical hardware device in the form of software or program. When the software or program is run, the above method flow can be reproduced.

[0069] Example 2 See Figure 6 This application also provides a current equalization method, including: S210. Obtain the current sampling signal collected by the sampling resistor 202 of each phase; S220. The current sampling signal is calibrated according to the fixed deviation calibration parameter of each phase sampling resistor 202 relative to the calibration reference resistor to obtain the calibration current sampling signal of each phase; wherein, the fixed deviation calibration parameter is obtained by performing fixed resistance value consistency calibration on the sampling resistor 202 of each phase in the multi-phase current sampling circuit 200 during the test phase. S230. Based on the difference between the calibration current sampling signal and the target current sampling signal, adjust the conduction time of each phase pulse width modulation signal to make the current of each phase equal.

[0070] In some embodiments, the fixed resistance consistency calibration of the sampling resistors 202 of each phase in the multiphase current sampling circuit 200 during the testing phase includes: injecting a standard current into each phase current sampling circuit at least twice in succession, and sampling the sampling voltage signal across the sampling resistor 202 at that time through an analog-to-digital converter; calculating a fixed deviation calibration parameter between the sampling resistor 202 of each phase and the calibration reference resistor based on the standard current, the sampling voltage signal, and the calibration reference resistor, wherein the fixed deviation calibration parameter includes a relative deviation coefficient and a fixed offset; and storing the fixed deviation calibration parameter in a register.

[0071] In some embodiments, calibrating the current sampling signal according to the fixed deviation calibration parameters to obtain the calibrated current sampling signal for each phase includes: calculating the calibrated voltage signal based on the sampled voltage signal, the relative deviation coefficient, and the fixed offset according to the calibration formula Vcscomp=(VcsADC+Koffset)×Kr; wherein, VcsADC is the original sampled voltage signal acquired in real time by the multi-phase current sampling circuit 200, Vcscomp is the calibrated voltage signal used as the input signal for current deviation calculation, Koffset is the fixed offset, and Kr is the relative deviation coefficient of the sampling resistor 202 in each phase at room temperature.

[0072] In some embodiments, before acquiring the current sampling signal collected by each phase sampling resistor, the method further includes: calibrating the temperature characteristics of each phase sampling resistor 202 to obtain the temperature drift coefficient of each phase sampling resistor 202.

[0073] While or after acquiring the current sampling signals collected by the sampling resistors of each phase, the method further includes: acquiring the current temperature within a preset distance range of each phase sampling resistor 202; calculating the temperature drift compensation parameters of each phase sampling resistor 202 based on the current temperature and the temperature drift coefficient; calibrating the current sampling signals according to the fixed deviation calibration parameters and the temperature drift compensation parameters; and using the calibrated signals as the calibrated current sampling signals.

[0074] In some embodiments, calibrating the current sampling signal according to the fixed deviation calibration parameter and the temperature drift compensation parameter includes: calibrating the current sampling signal according to the calibration formula Vcscomp=(VcsADC+Koffset)×krt to obtain a calibrated voltage signal, where krt=Kr×[1+a×(T-T0)+b×(T-T0)²], krt is the resistance compensation coefficient at the current temperature, Kr is the relative deviation coefficient of the sampling resistor 202 in each phase at room temperature, Koffset is the fixed offset, a is the first-order calibration compensation coefficient, b is the second-order calibration compensation coefficient, T is the current temperature, and T0 is the room temperature reference.

[0075] In some embodiments, before adjusting the conduction time of each phase pulse width modulation signal based on the difference between the calibration current sampling signal and the target current sampling signal, the method further includes: acquiring the temperature of each phase power device, calculating the deviation between the temperature of each phase and the average temperature, and obtaining a temperature deviation correction value for each phase based on the deviation; the step of adjusting the conduction time of each phase pulse width modulation signal based on the difference between the calibration current sampling signal and the target current sampling signal includes: generating a conduction time adjustment value of the pulse width modulation signal adapted to the temperature of each phase power device based on the temperature deviation correction value and the difference, and adjusting the conduction time of each phase pulse width modulation signal based on the conduction time adjustment value.

[0076] In some embodiments, the target current sampling signal is a sampled current of a certain phase or the average current of the sampled currents of all phases.

[0077] Example 3 See Figure 5 As shown in the illustration, this application embodiment also provides a multiphase power supply, including: The multi-phase power branch 310 is equipped with a current sampling circuit in each phase of the power branch. The current sampling circuit includes a sampling resistor 202 for acquiring the current sampling signal of each phase. The current balancing control system 100 integrates a resistance calibration and compensation module and a current balancing control module.

[0078] The resistance calibration compensation module is configured to perform fixed resistance consistency calibration on the sampling resistor 202 of the current sampling circuit of each phase during the test phase, and obtain the fixed deviation calibration parameters of the sampling resistor 202 of each phase relative to the calibration reference resistor. The current equalization control module is configured to: acquire current sampling signals of each phase in the working state; calibrate the current sampling signals according to the fixed deviation calibration parameters; and adjust the conduction time of the pulse width modulation signal of the corresponding phase power branch based on the difference between the calibrated current sampling signal and the target current, so as to make the current of each phase equal.

[0079] In some embodiments, the resistance calibration and compensation module is further configured to perform temperature characteristic calibration on each phase sampling resistor 202 during the testing phase to obtain the temperature drift coefficient of each phase sampling resistor 202; and to collect the current temperature of each phase sampling resistor 202 within a preset distance range during the working state, and calculate the temperature drift compensation parameters of each phase sampling resistor 202 based on the current temperature and the temperature drift coefficient. The resistance calibration and compensation module is further configured to calibrate the current sampling signal according to the temperature drift compensation parameter while or after calibrating the current sampling signal according to the fixed deviation calibration parameter.

[0080] In some embodiments, the current equalization control system further integrates a temperature equalization module, which is configured to: collect temperature information of each phase power branch; generate a temperature deviation correction value based on the temperature information; and the current equalization control module is further configured to adjust the conduction time of the pulse width modulation signal according to the temperature deviation correction value and the difference.

[0081] It should be noted that the current balancing method provided in Embodiment 2 and the multiphase power supply provided in Embodiment 3 of this application have the same technical concept or specific technical features as Embodiment 1 mentioned above. Their implementation principles and technical effects can be referred to each other, so they will not be described again.

[0082] This application also provides an electronic device, such as... Figure 7The electronic device may include: a housing 51, a processor 52, a memory 53, a circuit board 54, and a power supply circuit 55, wherein the circuit board 54 is disposed inside the space enclosed by the housing 51, and the processor 52 and the memory 53 are disposed on the circuit board 54; the power supply circuit 55 is used to supply power to various circuits or devices of the electronic device; the memory 53 is used to store executable program code; the processor 52 runs a program corresponding to the executable program code by reading the executable program code stored in the memory 53, for executing the current balancing method provided in any of the foregoing embodiments.

[0083] For details on the specific execution process of the above steps by the processor 52 and the steps further executed by the processor 52 by running executable program code, please refer to the description of the foregoing embodiments, which will not be repeated here.

[0084] The current equalization control system and multiphase power supply provided in this application embodiment can pre-calibrate and store fixed deviation calibration parameters at room temperature and recall them during operation, thereby eliminating the influence of resistance differences on the sampling signal from the source, which is beneficial to improving the accuracy of current equalization control.

[0085] Furthermore, to address the impact of temperature drift on the resistance sampling accuracy, while compensating for the inherent deviation of the resistor itself, temperature compensation calibration of the sampling results is performed in conjunction with real-time temperature acquisition. This can further effectively offset the impact of temperature fluctuations on the resistance value of sampling resistor 202, thereby improving the overall current balance control accuracy.

[0086] Furthermore, to address the temperature imbalance of power devices caused by uneven heat dissipation at the board level, the control parameters of each phase are dynamically adjusted by acquiring and correcting the temperature of the power devices to compensate for the impact of heat dissipation differences on the balance control results, thereby significantly improving the current balance stability, environmental adaptability and operational reliability of the multiphase power supply system.

[0087] It should be noted that while the various embodiments described herein have different focuses, they are interconnected. When understanding this application, reference can be made between the various embodiments. Furthermore, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or measurement control unit that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or measurement control unit. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or measurement control unit that includes said element.

[0088] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A current equalization control system, characterized by, The method comprises the following steps: a resistance calibration compensation module is configured to, in a test phase, perform fixed value consistency calibration on the sampling resistors of each phase in the multi-phase current sampling circuit to obtain fixed deviation calibration parameters of the sampling resistors of each phase relative to a calibration reference resistor; and obtain current sampling signals of each phase in a working state, and calibrate the current sampling signals according to the fixed deviation calibration parameters to obtain calibrated current sampling signals of each phase; a current balance control module is configured to adjust the on-time of the pulse width modulation signals of each phase according to the difference between the calibrated current sampling signals and target current sampling signals, so as to balance the currents of each phase.

2. The system of claim 1, wherein, The resistance calibration compensation module is specifically configured to: based on a standard current, a sampling voltage signal and a calibration reference resistor, calculate the fixed deviation calibration parameters between the sampling resistors of each phase and the calibration reference resistor, the fixed deviation calibration parameters including a relative deviation coefficient and a fixed offset; and store the fixed deviation calibration parameters to a register; wherein the sampling voltage signal is a voltage signal obtained by sampling the voltage across the sampling resistors when the standard current injected into each phase current sampling circuit in the test phase flows through the sampling resistors and is sampled by an analog-to-digital converter at least twice in succession.

3. The system of claim 2, wherein, The calibration of the current sampling signals according to the fixed deviation calibration parameters to obtain the calibrated current sampling signals of each phase comprises: based on the sampling voltage signal, the relative deviation coefficient and the fixed offset, calculating the calibrated voltage signal according to a calibration formula Vcscomp=(VcsADC+Koffset)×Kr; wherein VcsADC is the actual sampling voltage corresponding to the current sampling signal collected by the multi-phase current sampling circuit in real time, Vcscomp is the calibrated voltage signal used as an input signal for current deviation calculation, Koffset is the fixed offset, and Kr is the relative deviation coefficient of the sampling resistor in each phase at normal temperature.

4. The system of claim 1, wherein, The resistance calibration compensation module is further configured to, in the test phase, perform temperature characteristic calibration on the sampling resistors of each phase to obtain a temperature drift coefficient of the sampling resistors of each phase. In the working state, the current temperature within a preset distance range of the sampling resistors of each phase is collected, and based on the current temperature and the temperature drift coefficient, a temperature drift compensation parameter of the sampling resistors of each phase is calculated. The resistance calibration compensation module is further configured to calibrate the current sampling signals according to the fixed deviation calibration parameters and the temperature drift compensation parameter.

5. The system of claim 4, wherein, The calibration of the current sampling signals according to the fixed deviation calibration parameters and the temperature drift compensation parameter comprises: calibrating the current sampling signals according to a calibration formula Vcscomp=(VcsADC+Koffset)×krt to obtain a calibrated voltage signal, wherein krt=Kr×[1+a×(T-T0)+b×(T-T0)²], krt is a resistance compensation coefficient at the current temperature, Kr is the relative deviation coefficient of the sampling resistor in each phase at normal temperature, Koffset is the fixed offset, a is a first-order calibration compensation coefficient, b is a second-order calibration compensation coefficient, T is the current temperature, and T0 is a normal temperature reference.

6. The system of claim 2, wherein, The system further comprises a temperature calibration compensation module configured to collect the temperature of each phase power device in a working state, and obtain a temperature deviation correction value of each phase based on the temperature of each phase power device; The current balance control module is further configured to generate an on-time adjustment value of a pulse width modulation signal adapted to the temperature of each phase power device according to the temperature deviation correction value and the difference between the calibration current sampling signal and the target current sampling signal, and adjust the on-time of the pulse width modulation signal of each phase according to the on-time adjustment value, so as to balance the currents of each phase.

7. A current equalization method, characterized by, The method comprises: acquiring a current sampling signal collected by each phase sampling resistor; calibrating the current sampling signal according to a fixed deviation calibration parameter of each phase sampling resistor relative to a calibration reference resistor, to obtain a calibration current sampling signal of each phase; wherein the fixed deviation calibration parameter is obtained by performing fixed resistance consistency calibration on the sampling resistor of each phase in the multi-phase current sampling circuit in a test phase; adjusting the on-time of the pulse width modulation signal of each phase according to the difference between the calibration current sampling signal and the target current sampling signal, so as to balance the currents of each phase.

8. The method of claim 7, wherein, The fixed resistance consistency calibration on the sampling resistor of each phase in the multi-phase current sampling circuit in the test phase comprises: injecting a standard current into each phase current sampling circuit at least twice in sequence, and sampling the sampling voltage signal between the sampling resistor by an analog-to-digital converter; based on the standard current, the sampling voltage signal and the calibration reference resistor, calculating the fixed deviation calibration parameter between the sampling resistor of each phase and the calibration reference resistor, the fixed deviation calibration parameter comprising a relative deviation coefficient and a fixed offset; storing the fixed deviation calibration parameter to a register.

9. The method of claim 8, wherein, The calibration of the current sampling signal according to the fixed deviation calibration parameter to obtain the calibration current sampling signal of each phase comprises: calculating the calibrated voltage signal according to a calibration formula Vcscomp=(VcsADC+Koffset)×Kr based on the sampling voltage signal, the relative deviation coefficient and the fixed offset; wherein VcsADC is the original sampling voltage signal collected by the multi-phase current sampling circuit in real time, Vcscomp is the calibrated voltage signal, Koffset is the fixed offset, and Kr is the relative deviation coefficient of the sampling resistor in each phase at normal temperature.

10. The method of claim 7, wherein, Before acquiring the current sampling signal collected by each phase sampling resistor, the method further comprises: performing temperature characteristic calibration on each phase sampling resistor in a test phase to obtain a temperature drift coefficient of each phase sampling resistor; At the same time or after acquiring the current sampling signal collected by each phase sampling resistor, the method further comprises: collecting the current temperature within a preset distance range of each phase sampling resistor, and calculating a temperature drift compensation parameter of each phase sampling resistor based on the current temperature and the temperature drift coefficient; calibrating the current sampling signal according to the fixed deviation calibration parameter and the temperature drift compensation parameter, and taking the calibrated signal as the calibration current sampling signal.

11. The method of claim 10, wherein, The calibration of the current sampling signal according to the fixed deviation calibration parameter and the temperature drift compensation parameter comprises: calibrating the current sampling signal according to a calibration formula Vcscomp=(VcsADC+Koffset)×krt to obtain a calibrated voltage signal, wherein krt=Kr×[1+a×(T-T0)+b×(T-T0)²], krt is a resistance compensation coefficient at a current temperature, Kr is a relative deviation coefficient of the sampling resistor in each phase at a normal temperature, Koffset is a fixed offset, a is a first-order calibration compensation coefficient, b is a second-order calibration compensation coefficient, T is a current temperature, and T0 is a normal temperature reference.

12. The method of claim 7, wherein, Before the adjustment of the on-time of the pulse width modulation signal of each phase according to the difference between the calibrated current sampling signal and the target current sampling signal, the current temperature of each phase power device is collected, the deviation of each phase temperature from the average temperature is calculated, and a temperature deviation correction value of each phase is obtained based on the deviation. The adjustment of the on-time of the pulse width modulation signal of each phase according to the difference between the calibrated current sampling signal and the target current sampling signal comprises: generating an on-time adjustment value of the pulse width modulation signal of each phase power device according to the temperature deviation correction value and the difference, and adjusting the on-time of the pulse width modulation signal of each phase according to the on-time adjustment value.

13. The method of claim 7, wherein, The target current sampling signal is a certain phase sampling current or an average current of each phase sampling current.

14. A multi-phase power supply, characterized by, Comprise: A plurality of phase power branches, each phase power branch is provided with a current sampling circuit, and the current sampling circuit comprises a sampling resistor for collecting a current sampling signal of each phase; A current balance control system integrated with: A resistance calibration compensation module configured to perform fixed resistance consistency calibration on the sampling resistor of the current sampling circuit of each phase in a test stage, and obtain a fixed deviation calibration parameter of the sampling resistor of each phase relative to a calibration reference resistor; A current balance control module configured to: in a working state, collect a current sampling signal of each phase; calibrate the current sampling signal according to the fixed deviation calibration parameter; and adjust the on-time of the pulse width modulation signal of the corresponding phase power branch based on the difference between the calibrated current sampling signal and a target current, so that the currents of each phase are balanced.

15. The multi-phase power supply of claim 14, wherein, The resistance calibration compensation module is further configured to perform temperature characteristic calibration on the sampling resistor of each phase in the test stage, and obtain a temperature drift coefficient of the sampling resistor of each phase; In the working state, the current temperature within a preset distance range of the sampling resistor of each phase is collected, and a temperature drift compensation parameter of the sampling resistor of each phase is calculated based on the current temperature and the temperature drift coefficient; The resistance calibration compensation module is further configured to calibrate the current sampling signal according to the temperature drift compensation parameter at the same time or after the calibration of the current sampling signal according to the fixed deviation calibration parameter.

16. The multi-phase power supply of claim 14 or 15, characterized in that: The current balance control system further integrates a temperature balance module, and the temperature balance module is configured to collect temperature information of each phase power branch; generate a temperature deviation correction value based on the temperature information; The current equalization control module is further configured to adjust the on-time of the pulse width modulation signal according to the temperature deviation correction value and the difference.

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